scheme code generate variable series with leading "\"

[MING TSANG]

Dear lilyponders:I do not know scheme code. Can scheme code to generate 
variable series with leading "\"?Detail question in the lily file 
attachment.Thank you for any help.Immanuel,Ming.

\version "2.19.46"
\language "english"

\header {
  title = "感谢一生有祢"
  subtitle = "Thank You For Being In My Life"
  composer = "曲詞 : 陳玉彬"
}

\layout {
  \context {
    \Voice
    \consists "Melody_engraver"
    \override Stem #'neutral-direction = #'()
  }
}

global = {
  \key c \major
  \numericTimeSignature
  \time 4/4
  \partial 4
  \tempo 4=76
}


mel.0 = { <>^\markup{\box\bold"Verse"} g8 8 |}
mel.1 = { c'8. 16~8 b d' c'~8 b~ |}
mel.2 = { b8 a'8~4 r8 g'8 8 8 |}
mel.3 = { f'4. e'8 g' a c'8 16 e'16~ | \break }
mel.4 = { e'8 d'~4~4. g'8 |}
mel.5 = { a'4. g'8 4. e'16 f' |}
mel.6 = { g'8 f'16 g'~8 f' e'4. d'8 |}
mel.7 = { c'4 r16 c'16 a c' a'8 e'16 f'~8 g'~ | \break }

melody =   {
  \global
%{ 
  can the following be generated by Scheme code 
  such as "\expendVar xx 0 7" where xx is the variable "\mel"; 
  "0" is start number and "7 "is the end number.  
%}
  \mel.0 \mel.1 \mel.2 \mel.3
  \mel.4 \mel.5 \mel.6 \mel.7
  
}



\score {
  <<

    \new Staff { \melody }

  >>
  \layout { }
  \midi { }
}
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